Alexander meissner



A. MEISSNER SENDING ARRANGEMENT Filed Sept. 5, 1921 avwwntoz 17L EXHNDERMf/SSA/t'l? Patented Dec. 22, 1925.

UNITED STATES ALEXANDER MEI SSNER, OE BERLIN, GERMANY, ASSIGNOR TGESELLSCHAFT DRAHTLOSE TELEGRAPHIE B. HJHALLESGHES, OF BERLIN, GERMANY,A COR- PORATION OF GERMANY.

snnnme ARRANGEMENT.

Application filed September 3, 1921. Serial No. 498,421.

(GRANTED UNDER THE PROVISIONS OF THE ACT OF MARCH. 3, 1921, 41 STAT.11,1313.)

To all whom it may concern:

Be it known that I, ALEXANDER MnrssNnR, citizen of the German Republic,residing at Berlin, Germany, have invented certain new and usefulImprovements in Sending Ar-.

rangements for which I have filed applications as follows: Germany,iPatNo, 317,541, filed'Oct. 24,1918; Argentina, RegisterNo. 21 333/236,filed July 20, 1920; Brazil, Register No. 172 38, filed July 10, 1920;Chile,

filed Sept. 23, 1920; Denmark, Register No.

3423/19, filed Dec, 18, 1919; Netherlands, Register No. 14287, filedMarch 13,1920; Japan, Register No. 58307, filed July 1,1920; Norway,Register No. 18896/19, filed Dec.

31, 1919; Austria, Register No. A3370/19, filed Dec. 23, 1919; Peru,filed Oct. 29,1920:

Sweden, Register No. 50.290/19,.filed Nov. 25, 1919; Spain, PatentNo.72216, Czechoslovakia, Re i'ster No. P. 4766/20, filed June 25, 1920),01 which the following is a specification,

German Patent No. 304,361, and addition Patent, No. 310,731, describecircuit arrangements which prevent the intrusion into the antenna of theharmonics generated by the high frequency generator. It has been foundthat the object cannot be fully attained by the means disclosed in thesepatents, butv that, on the contrary, a certain portion of the harmonicsstill reaches the antenna circuit and is then radiated therefrom. Inorder to avoid under all circumstances the resulting disturbances in theneighboring receiving stations, the present invention provides animprovement of the circuit arrangements disclosed in the abovementionedpatents in which'one or a plurality of oscillating circuits tuned to thefundamental frequency of the arrangement are branched from parts of theantenna inductance.

The single figure of the drawing shows a circuit arrangement adapted forthis purpose.

As shown, the antenna A is grounded and contains the secondary coil T ofa transformer, the primary winding of which is connected with the highfrequency generator. Obviously, if a cathode tube generator is employed,the cathode tube with its associated coupling elements may be con;nected into the antenna circuit in place of :the secondary 11 A closedor loop circuit S is connected to the antenna and ground in parallelwith the secondary winding T, and this circuit is'tuned to thefundamental frequency radiated by the antenna A. The c1rcu1t SpreseritsQan infinite resistance to current of the fundamentalfrequency, but short circuits the harmonics.

The present invention provides for improve-- ATENT OFFICE].

ments in this circuit which forms the sub-1:. ]ect of the older patents,and, in accordance with the invention, one orv a plurality of tuned'loop circuits K are provided in the form of chain connections branchedoff from 'difierentpoints in the antenna self-induct ance L. In otherwords, an inductance is provided between the points of connection withthe antenna of the circuit S and the first circuit K, and inductancesare also provided between the points of connection with the antenna ofthe circuits K, when a plua rality of circuits K are employed. Thecircuits K are also tuned to the fundamental against the latter. On theother hand, the

harmonics that reach the antenna notwithstanding the circuit S, find inthe circuits K a path of slight resistance, and are, therefore,conducted through circuit K to ground and are not radiated from theantenna.

Obviously, the above described circuit arrangement can also be used incase, instead of a cathode tube generator, high frequency generators ofother types, such as are lamps, high frequency machines or similardevices are employed for producing the high frequency oscillations.

Having described my invention, what I claim is: g I

1. A sending arrangement for wireless telegraphy and telephonycomprising a grounded antenna, a groundedv loop circuit connected to theantenna in parallel with its grounded portion and tuned to the fundawith each otherand with the grounded portion of the antenna and tuned tothe fundamental frequency of the arrangement, and inductances in theantenna between the points of connection of said circuits thereto.

3. A sending arrangement for wireless telegraphy and telephonycomprising a grounded antenna and means-for.preventing, radiationofh-armonics from 'the; antenna;

said means comprising a plurality, of. loop circuits connected withthaantenna in parallel with each other i and each; comprising capacity. andan inductance, ,and ind'uctances in-the antenna.hetween thepoints ofconnection of said circuits thereto :A sending arrangement for wirelesstelegraphy Wand telephony; coi11p *ising, a grounded antenna having asource cf energy connected therein, grounded 10 circuit connected to theantenna in parallel with s aid source and tuned to'the fundamentalfrequency of the arrangement, a second grounded loop circuit connectedto the an;

tenna in parallel with said first nientioned circuit and also tuned tosaid fundainental frequency.,and a reactance in the" antenna between thepoints of connection of said loop circuits thereto. 7 r

6, A sending arrangement for Wireless telegraphy and telephonycomprising, a grounded antennahaving a source. of energy connectedtherein, a grounded.loop circuit connected with the antenna inparallelitosaidsourceand tuned to the fundamental.

frequency of the arrangen'ient andfreactances 4B in the antenna'onopposite sides of ,thevppint of connection of said loop circuit thereto.7 v7 sending arrangement for @Wireless telegraphy and vtelephonycomprising, a

grounded antenna having a source; of en- 5 ergy connected therein, agroundedloop' c1r cuit. connected to they antenna in parallel .to. saidsource-and, tuned. to the fui'idainental frequency; of the arrangement,and a react-- source-. A In testimony whereof I afiixthe. signature.

ALEXANDER MEISSNER;

ance, in the ,antenna be'tween the point of' connectlon of sald circuitthereto .andfsaid

